拦截器: 用来对访问的url进行拦截处理
用处: 权限验证,乱码设置等
spring-mvc.xml文件中的配置:
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< beans xmlns = "http://www.springframework.org/schema/beans" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns:p = "http://www.springframework.org/schema/p" xmlns:context = "http://www.springframework.org/schema/context" xmlns:mvc = "http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http://www.springframework.org/schema/tx "> |
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<!--编写拦截器--> < mvc:interceptors > <!--对特定的url拦截--> < mvc:interceptor > < mvc:mapping path = "/test.do" /> < bean class = "com.hbut.interceptor.TestInterceptor" /> </ mvc:interceptor > < mvc:interceptor > <!--对特定的模块拦截第一级别拦截--> < mvc:mapping path = "/test/×/" /> < bean class = "com.hbut.interceptor.TestInterceptor1" /> </ mvc:interceptor > < mvc:interceptor > <!--对特定的模块拦截--> < mvc:mapping path = "/test/×" /> < bean class = "com.hbut.interceptor.TestInterceptor2" /> </ mvc:interceptor > </ mvc:interceptors > |
对所有的url进行拦截
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< mvc:interceptors > < bean class = "org.springframework.web.servlet.i18n.LocaleChangeInterceptor" /> </ mvc:interceptors > |
java代码
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package com.hbut.interceptor; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * @Author XiJun.Gong * @DATE 2016/6/1. * aim: com.hbut.interceptor */ public class TestInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception { //todo 在此处添加要操作code System.out.println( "preHandle" ); return true ; //todo 此处为false时,请求不会到达control层 } @Override public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { System.out.println( "postHandle" ); //todo 可以用来修改信息,跳转等 } @Override public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { System.out.println( "afterCompletion" ); //todo 最后执行 } } |
另一种拦截器:大同小异
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package com.hbut.interceptor; import org.springframework.ui.ModelMap; import org.springframework.web.context.request.WebRequest; import org.springframework.web.context.request.WebRequestInterceptor; /** * @Author XiJun.Gong * @DATE 2016/6/1. * aim: com.hbut.interceptor */ public class Test2Interceptor implements WebRequestInterceptor { @Override public void preHandle(WebRequest webRequest) throws Exception { } @Override public void postHandle(WebRequest webRequest, ModelMap modelMap) throws Exception { } @Override public void afterCompletion(WebRequest webRequest, Exception e) throws Exception { } } |
过滤器: 依赖于servlet容器,使用回调函数,过滤范围大
拦截器: 依赖于框架容器 比如spring、mybatis ,灵活
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/gongxijun/p/5551542.html